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DEVELOPMENT OF THE TELESCOPE
SOME BASIC OPTICS
12 other sections not shown
98 inch aberration altitude angle angular aperture arc second astronomical atmosphere axial bearing bright camera celestial pole centre Chapter chromatic corrector coude flat coude spectrograph declination axis diagram diameter diffraction disc dispersion displacement distance dome Dominion Astrophysical Observatory drive Earth ecliptic edge equatorial mounting equipment European Southern Observatory eyepiece field lens Figure focal length focal plane focal ratio gear glass grating horizontal inch telescope incident infrared instrument Kitt Peak large telescopes lenses light measured meridian mirror cell modern telescope mounted object Observatory observing floor optical axis orbit pencil polar axis position primary mirror prime focus prism produced radiation ray path reflecting telescope reflector refractive index refractor rotation Royal Greenwich Observatory secondary mirror Serrurier truss shown shows slit solar spectral spectrograph spectrum spherical star image surface synchro telescope tube temperature upper end velocity wavefront wavelength zenith